Start a project flow among several projects

Hi,
I have developed two projects, and I would like to know if there is a mean to start specifically one of the two using the command line.

Thx.

Yes, by providing the name of the project in the command line in the same way you specify the flow file to use:

node-red my-project

Thx.
About specification of the flow file, is it the same syntax ? I haven't found any thing about that in the doc, can you give me a hint ?

Page one of the docs - https://nodered.org/docs/getting-started/running#command-line-usage - if the name is a project name it uses that

Is it possible to limit access of projects according to the user login?

What sort of limit access do you mean? Do you want a user to only be able to access certain projects from the 'Open Project' menu? If that is the case, then no, you can't do that.

Thank you, that's what I wanted...